Replaceable developer unit



FIG. 1 is a right, front and top perspective view of a replaceable developer unit showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a front elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a top plan view; and

FIG. 7 is a bottom plan view. 

The ornamental design for a replaceable developer unit, as shown and described. 